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And Mr McDonnell said: "On the day that the IMF has echoed Labour's warnings about the global economy and called for the Government to increase investment spending, the Chancellor decides to demean his office with schoolboy jokes about mental health.

"If the Chancellor could at least appreciate how angry families of steelworkers in south Wales are, knowing that when bankers' bonuses were threatened, he immediately shot across to Brussels with an army of lawyers to defend them, and he'll jump into a helicopter for a Tory fundraiser, but it's taken him four months to lift a finger for steelworkers".

Labour MP Kate Osamor added: "He used the term 'has he lost his marbles', which I feel was very unparliamentary.

"But I also would like to say that this comment comes in the week when the Government has been exposed as leaving mental health services underfunded.

"So what the Chancellor has said goes to the heart of their callous attitude towards vulnerable people and I wanted to put that on the record."